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15 papers · 2 filters
The X-ray view of optically selected dual AGN
Alessandra De Rosa, Cristian Vignali, Paola Severgnini +12
We present a study of optically selected dual AGN with projected separations of 3--97~kpc. Using multi-wavelength (MWL) information (optical, X-rays, mid-IR), we characterized the…
Stellar Properties for a Comprehensive Collection of Star Forming Regions in the SDSS APOGEE-2 Survey
Carlos G. Román-Zúñiga, Marina Kounkel, Jesús Hernández +25
The Sloan Digital Sky Survey IV (SDSS-IV) APOGEE-2 primary science goal was to observe red giant stars throughout the Galaxy to study its dynamics, morphology, and chemical evoluti…
A Transient "Changing-look'' Active Galactic Nucleus Resolved on Month Timescales from First-year Sloan Digital Sky Survey V Data
Grisha Zeltyn, Benny Trakhtenbrot, Michael Eracleous +32
We report the discovery of a new ``changing-look'' active galactic nucleus (CLAGN) event, in the quasar SDSS J162829.17+432948.5 at z=0.2603, identified through repeat spectroscopy…
Backscattering and Line Broadening in Orion
C. R. O'Dell, G. J. Ferland, J. E. Mendez-Delgado
Examination of emission lines in high-velocity resolution optical spectra of the Orion Nebula confirms that the velocity component on the red wing of the main ionization front emis…
The Properties of Low-Redshift FeLoBAL Quasars: III. The Location and Geometry of the Outflows
Hyunseop Choi, Karen M. Leighly, Collin Dabbieri +3
We present continued analysis of a sample of low-redshift iron low-ionization broad absorption-line quasars (FeLoBALQs). Choi et al. (2022) presented spectral analysis of…
The stellar metallicity gradients of Local Group dwarf galaxies
S. Taibi, G. Battaglia, R. Leaman +5
Through a homogeneous analysis of spectroscopic literature data of red giant stars, we determine the radial metallicity profiles of 30 dwarf galaxies in the Local Group. We explore…
Turbulence in Milky Way Star-Forming Regions Traced by Young Stars and Gas
Trung Ha, Yuan Li, Marina Kounkel +3
The interstellar medium (ISM) is turbulent on all scales and in all phases. In this paper, we study turbulence with different tracers in four nearby star-forming regions: Orion, Op…
The Milky Way tomography with APOGEE: intrinsic density distribution and structure of mono-abundance populations
Jianhui Lian, Gail Zasowski, Ted Mackereth +11
The spatial distribution of mono-abundance populations (MAPs, selected in [Fe/H] and [Mg/Fe]) reflect the chemical and structural evolution in a galaxy and impose strong constraint…
Multiplicity Statistics of Stars in the Sagittarius Dwarf Spheroidal Galaxy: Comparison to the Milky Way
Victoria Bonidie, Travis Court, Christine Mazzola Daher +17
We use time-resolved spectra from the Apache Point Observatory Galactic Evolution Experiment (APOGEE) to examine the distribution of radial velocity (RV) variations in 249 stars id…
The Physical Properties of Low Redshift FeLoBAL Quasars. I. Spectral Synthesis Analysis of the BAL Outflows using
Hyunseop Choi, Karen M. Leighly, Donald M. Terndrup +3
We present the first systematic study of 50 low redshift () iron low-ionization broad absorption-line quasars (FeLoBALQs) using which represents a more th…
Low Mass Stars as Tracers of Star and Cluster Formation
S. T. Megeath, R. A. Gutermuth, M. A. Kounkel
We review the use of young low mass stars and protostars, or young stellar objects (YSOs), as tracers of star formation. Observations of molecular clouds at visible, infrared, radi…
Empirical Constraints on the Nucleosynthesis of Nitrogen
James W. Johnson, David H. Weinberg, Fiorenzo Vincenzo +2
We derive empirical constraints on the nucleosynthetic yields of nitrogen by incorporating N enrichment into our previously developed and empirically tuned multi-zone galactic chem…
Eccentricity evolution of massive black hole binaries from formation to coalescence
Alessia Gualandris, Fazeel Mahmood Khan, Elisa Bortolas +4
Coalescing supermassive black hole binaries (BHBs) are expected to be the loudest sources of gravitational waves (GWs) in the Universe. Detection rates for ground or space-based de…
APOGEE Net: An expanded spectral model of both low mass and high mass stars
Dani Sprague, Connor Culhane, Marina Kounkel +17
We train a convolutional neural network, APOGEE Net, to predict , , and, for some stars, [Fe/H], based on the APOGEE spectra. This is the first pipeline ada…
The Time Domain Spectroscopic Survey: Changing-Look Quasar Candidates from Multi-Epoch Spectroscopy in SDSS-IV
Paul J. Green, Lina Pulgarin-Duque, Scott F. Anderson +18
Active galactic nuclei (AGN) can vary significantly in their rest-frame optical/UV continuum emission, and with strong associated changes in broad line emission, on much shorter ti…